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Birte Boelt

The Use of Remote Sensing to Determine Nitrogen Status in Perennial Ryegrass (Lolium perenne L.) for Seed Production

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The Use of Remote Sensing to Determine Nitrogen Status in Perennial Ryegrass (Lolium perenne L.) for Seed Production. / Gislum, René; Thomopoulos, Stamatios; Gyldengren, Jacob Glerup; Mortensen, Anders Krogh; Boelt, Birte.

In: Nitrogen, Vol. 2, No. 2, 06.2021, p. 229-243.

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@article{681ca966790f4bdd90b8c69815cbea40,
title = "The Use of Remote Sensing to Determine Nitrogen Status in Perennial Ryegrass (Lolium perenne L.) for Seed Production",
abstract = "Sufficient nitrogen (N) supply is decisive to achieve high grass seed yields while overfertilization will lead to negative environmental impact. From the literature, estimation of N rates taking into account the crop{\textquoteright}s N status and its yield potential, seems promising for attaining high yields and averting adverse environmental impacts. This study aimed at an evaluation of remote sensing to predict final seed yield, N traits of the grass seed crop and the usability of nitrogen nutrition index (NNI) to measure additional N requirement. It included four years{\textquoteright} data and eight N application rates and strategies. Several reflectance measurements were made and used for the calculation of 18 vegetation indices. The predictions were made using partial least square regression and support vector machine. Three different yield responses to N fertilization were noted; one with linear response, one with optimum economic nitrogen (EON) at ~188 kg N ha−1, and one with EON at ~138 kg N ha−1. We conclude that although it is possible to make in-season predictions of NNI, it does not always portray the differences in yield potential; thus, it is challenging to utilize it to optimize N application.",
keywords = "critical nitrogen dilution curve, nitrogen nutrition index, precision agriculture, nitrogen uptake",
author = "Ren{\'e} Gislum and Stamatios Thomopoulos and Gyldengren, {Jacob Glerup} and Mortensen, {Anders Krogh} and Birte Boelt",
year = "2021",
month = jun,
doi = "10.3390/nitrogen2020015",
language = "English",
volume = "2",
pages = "229--243",
journal = "Nitrogen",
issn = "2504-3129",
publisher = "MDPI",
number = "2",

}

RIS

TY - JOUR

T1 - The Use of Remote Sensing to Determine Nitrogen Status in Perennial Ryegrass (Lolium perenne L.) for Seed Production

AU - Gislum, René

AU - Thomopoulos, Stamatios

AU - Gyldengren, Jacob Glerup

AU - Mortensen, Anders Krogh

AU - Boelt, Birte

PY - 2021/6

Y1 - 2021/6

N2 - Sufficient nitrogen (N) supply is decisive to achieve high grass seed yields while overfertilization will lead to negative environmental impact. From the literature, estimation of N rates taking into account the crop’s N status and its yield potential, seems promising for attaining high yields and averting adverse environmental impacts. This study aimed at an evaluation of remote sensing to predict final seed yield, N traits of the grass seed crop and the usability of nitrogen nutrition index (NNI) to measure additional N requirement. It included four years’ data and eight N application rates and strategies. Several reflectance measurements were made and used for the calculation of 18 vegetation indices. The predictions were made using partial least square regression and support vector machine. Three different yield responses to N fertilization were noted; one with linear response, one with optimum economic nitrogen (EON) at ~188 kg N ha−1, and one with EON at ~138 kg N ha−1. We conclude that although it is possible to make in-season predictions of NNI, it does not always portray the differences in yield potential; thus, it is challenging to utilize it to optimize N application.

AB - Sufficient nitrogen (N) supply is decisive to achieve high grass seed yields while overfertilization will lead to negative environmental impact. From the literature, estimation of N rates taking into account the crop’s N status and its yield potential, seems promising for attaining high yields and averting adverse environmental impacts. This study aimed at an evaluation of remote sensing to predict final seed yield, N traits of the grass seed crop and the usability of nitrogen nutrition index (NNI) to measure additional N requirement. It included four years’ data and eight N application rates and strategies. Several reflectance measurements were made and used for the calculation of 18 vegetation indices. The predictions were made using partial least square regression and support vector machine. Three different yield responses to N fertilization were noted; one with linear response, one with optimum economic nitrogen (EON) at ~188 kg N ha−1, and one with EON at ~138 kg N ha−1. We conclude that although it is possible to make in-season predictions of NNI, it does not always portray the differences in yield potential; thus, it is challenging to utilize it to optimize N application.

KW - critical nitrogen dilution curve

KW - nitrogen nutrition index

KW - precision agriculture

KW - nitrogen uptake

U2 - 10.3390/nitrogen2020015

DO - 10.3390/nitrogen2020015

M3 - Journal article

VL - 2

SP - 229

EP - 243

JO - Nitrogen

JF - Nitrogen

SN - 2504-3129

IS - 2

ER -